Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 3
   4 SUBLEVEL = 18
   5 EXTRAVERSION =
   6 NAME = Bobtail Squid
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub_make_done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # Kbuild will save output files in the current working directory.
 100 # This does not need to match to the root of the kernel source tree.
 101 #
 102 # For example, you can do this:
 103 #
 104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105 #
 106 # If you want to save output files in a different location, there are
 107 # two syntaxes to specify it.
 108 #
 109 # 1) O=
 110 # Use "make O=dir/to/store/output/files/"
 111 #
 112 # 2) Set KBUILD_OUTPUT
 113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115 #
 116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117 # variable.
 118
 119 # Do we want to change the working directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 ifneq ($(KBUILD_OUTPUT),)
 125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126 # expand a shell special character '~'. We use a somewhat tedious way here.
 127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128 $(if $(abs_objtree),, \
 129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131 # $(realpath ...) resolves symlinks
 132 abs_objtree := $(realpath $(abs_objtree))
 133 else
 134 abs_objtree := $(CURDIR)
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137 ifeq ($(abs_objtree),$(CURDIR))
 138 # Suppress "Entering directory ..." unless we are changing the work directory.
 139 MAKEFLAGS += --no-print-directory
 140 else
 141 need-sub-make := 1
 142 endif
 143
 144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147 $(error source directory cannot contain spaces or colons)
 148 endif
 149
 150 ifneq ($(abs_srctree),$(abs_objtree))
 151 # Look for make include files relative to root of kernel src
 152 #
 153 # This does not become effective immediately because MAKEFLAGS is re-parsed
 154 # once after the Makefile is read. We need to invoke sub-make.
 155 MAKEFLAGS += --include-dir=$(abs_srctree)
 156 need-sub-make := 1
 157 endif
 158
 159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162 need-sub-make := 1
 163 # Cancel implicit rules for this Makefile.
 164 $(lastword $(MAKEFILE_LIST)): ;
 165 endif
 166
 167 export abs_srctree abs_objtree
 168 export sub_make_done := 1
 169
 170 ifeq ($(need-sub-make),1)
 171
 172 PHONY += $(MAKECMDGOALS) sub-make
 173
 174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175         @:
 176
 177 # Invoke a second make in the output directory, passing relevant variables
 178 sub-make:
 179         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181 endif # need-sub-make
 182 endif # sub_make_done
 183
 184 # We process the rest of the Makefile if this is the final invocation of make
 185 ifeq ($(need-sub-make),)
 186
 187 # Do not print "Entering directory ...",
 188 # but we want to display it when entering to the output directory
 189 # so that IDEs/editors are able to understand relative filenames.
 190 MAKEFLAGS += --no-print-directory
 191
 192 # Call a source code checker (by default, "sparse") as part of the
 193 # C compilation.
 194 #
 195 # Use 'make C=1' to enable checking of only re-compiled files.
 196 # Use 'make C=2' to enable checking of *all* source files, regardless
 197 # of whether they are re-compiled or not.
 198 #
 199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 200 # including where to get the "sparse" utility.
 201
 202 ifeq ("$(origin C)", "command line")
 203   KBUILD_CHECKSRC = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Call message checker as part of the C compilation
 210 #
 211 # Use 'make D=1' to enable checking
 212 # Use 'make D=2' to create the message catalog
 213
 214 ifdef D
 215   ifeq ("$(origin D)", "command line")
 216     KBUILD_KMSG_CHECK = $(D)
 217   endif
 218 endif
 219 ifndef KBUILD_KMSG_CHECK
 220   KBUILD_KMSG_CHECK = 0
 221 endif
 222
 223 # Use make M=dir to specify directory of external module to build
 224 # Old syntax make ... SUBDIRS=$PWD is still supported
 225 # Setting the environment variable KBUILD_EXTMOD take precedence
 226 ifdef SUBDIRS
 227   $(warning ================= WARNING ================)
 228   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 229   $(warning )
 230   $(warning If you are building an individual subdirectory)
 231   $(warning in the kernel tree, you can do like this:)
 232   $(warning $$ make path/to/dir/you/want/to/build/)
 233   $(warning (Do not forget the trailing slash))
 234   $(warning )
 235   $(warning If you are building an external module,)
 236   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 237   $(warning ==========================================)
 238   KBUILD_EXTMOD ?= $(SUBDIRS)
 239 endif
 240
 241 ifeq ("$(origin M)", "command line")
 242   KBUILD_EXTMOD := $(M)
 243 endif
 244
 245 export KBUILD_CHECKSRC KBUILD_EXTMOD
 246
 247 ifeq ($(abs_srctree),$(abs_objtree))
 248         # building in the source tree
 249         srctree := .
 250         building_out_of_srctree :=
 251 else
 252         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 253                 # building in a subdirectory of the source tree
 254                 srctree := ..
 255         else
 256                 srctree := $(abs_srctree)
 257         endif
 258         building_out_of_srctree := 1
 259 endif
 260
 261 ifneq ($(KBUILD_ABS_SRCTREE),)
 262 srctree := $(abs_srctree)
 263 endif
 264
 265 objtree         := .
 266 VPATH           := $(srctree)
 267
 268 export building_out_of_srctree srctree objtree VPATH
 269
 270 # To make sure we do not include .config for any of the *config targets
 271 # catch them early, and hand them over to scripts/kconfig/Makefile
 272 # It is allowed to specify more targets when calling make, including
 273 # mixing *config targets and build targets.
 274 # For example 'make oldconfig all'.
 275 # Detect when mixed targets is specified, and make a second invocation
 276 # of make so .config is not included in this case either (for *config).
 277
 278 version_h := include/generated/uapi/linux/version.h
 279 old_version_h := include/linux/version.h
 280
 281 clean-targets := %clean mrproper cleandocs
 282 no-dot-config-targets := $(clean-targets) \
 283                          cscope gtags TAGS tags help% %docs check% coccicheck \
 284                          $(version_h) headers headers_% archheaders archscripts \
 285                          %asm-generic kernelversion %src-pkg
 286 no-sync-config-targets := $(no-dot-config-targets) install %install \
 287                            kernelrelease
 288
 289 config-targets  := 0
 290 mixed-targets   := 0
 291 dot-config      := 1
 292 may-sync-config := 1
 293
 294 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 295         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 296                 dot-config := 0
 297         endif
 298 endif
 299
 300 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 301         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 302                 may-sync-config := 0
 303         endif
 304 endif
 305
 306 ifneq ($(KBUILD_EXTMOD),)
 307         may-sync-config := 0
 308 endif
 309
 310 ifeq ($(KBUILD_EXTMOD),)
 311         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 312                 config-targets := 1
 313                 ifneq ($(words $(MAKECMDGOALS)),1)
 314                         mixed-targets := 1
 315                 endif
 316         endif
 317 endif
 318
 319 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 320 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 321         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 322                 mixed-targets := 1
 323         endif
 324 endif
 325
 326 # install and modules_install need also be processed one by one
 327 ifneq ($(filter install,$(MAKECMDGOALS)),)
 328         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 329                 mixed-targets := 1
 330         endif
 331 endif
 332
 333 ifeq ($(mixed-targets),1)
 334 # ===========================================================================
 335 # We're called with mixed targets (*config and build targets).
 336 # Handle them one by one.
 337
 338 PHONY += $(MAKECMDGOALS) __build_one_by_one
 339
 340 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 341         @:
 342
 343 __build_one_by_one:
 344         $(Q)set -e; \
 345         for i in $(MAKECMDGOALS); do \
 346                 $(MAKE) -f $(srctree)/Makefile $$i; \
 347         done
 348
 349 else
 350
 351 include scripts/Kbuild.include
 352
 353 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 354 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 355 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 356 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 357
 358 include scripts/subarch.include
 359
 360 # Cross compiling and selecting different set of gcc/bin-utils
 361 # ---------------------------------------------------------------------------
 362 #
 363 # When performing cross compilation for other architectures ARCH shall be set
 364 # to the target architecture. (See arch/* for the possibilities).
 365 # ARCH can be set during invocation of make:
 366 # make ARCH=ia64
 367 # Another way is to have ARCH set in the environment.
 368 # The default ARCH is the host where make is executed.
 369
 370 # CROSS_COMPILE specify the prefix used for all executables used
 371 # during compilation. Only gcc and related bin-utils executables
 372 # are prefixed with $(CROSS_COMPILE).
 373 # CROSS_COMPILE can be set on the command line
 374 # make CROSS_COMPILE=ia64-linux-
 375 # Alternatively CROSS_COMPILE can be set in the environment.
 376 # Default value for CROSS_COMPILE is not to prefix executables
 377 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 378 ARCH            ?= $(SUBARCH)
 379
 380 # Architecture as present in compile.h
 381 UTS_MACHINE     := $(ARCH)
 382 SRCARCH         := $(ARCH)
 383
 384 # Additional ARCH settings for x86
 385 ifeq ($(ARCH),i386)
 386         SRCARCH := x86
 387 endif
 388 ifeq ($(ARCH),x86_64)
 389         SRCARCH := x86
 390 endif
 391
 392 # Additional ARCH settings for sparc
 393 ifeq ($(ARCH),sparc32)
 394        SRCARCH := sparc
 395 endif
 396 ifeq ($(ARCH),sparc64)
 397        SRCARCH := sparc
 398 endif
 399
 400 # Additional ARCH settings for sh
 401 ifeq ($(ARCH),sh64)
 402        SRCARCH := sh
 403 endif
 404
 405 KCONFIG_CONFIG  ?= .config
 406 export KCONFIG_CONFIG
 407
 408 # SHELL used by kbuild
 409 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 410           else if [ -x /bin/bash ]; then echo /bin/bash; \
 411           else echo sh; fi ; fi)
 412
 413 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 414 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 415 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 416
 417 HOSTCC       = gcc
 418 HOSTCXX      = g++
 419 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 420                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 421                 $(HOSTCFLAGS)
 422 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 423 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 424 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 425
 426 # Make variables (CC, etc...)
 427 AS              = $(CROSS_COMPILE)as
 428 LD              = $(CROSS_COMPILE)ld
 429 CC              = $(CROSS_COMPILE)gcc
 430 CPP             = $(CC) -E
 431 AR              = $(CROSS_COMPILE)ar
 432 NM              = $(CROSS_COMPILE)nm
 433 STRIP           = $(CROSS_COMPILE)strip
 434 OBJCOPY         = $(CROSS_COMPILE)objcopy
 435 OBJDUMP         = $(CROSS_COMPILE)objdump
 436 OBJSIZE         = $(CROSS_COMPILE)size
 437 PAHOLE          = pahole
 438 LEX             = flex
 439 YACC            = bison
 440 AWK             = awk
 441 INSTALLKERNEL  := installkernel
 442 DEPMOD          = /sbin/depmod
 443 PERL            = perl
 444 PYTHON          = python
 445 PYTHON2         = python2
 446 PYTHON3         = python3
 447 CHECK           = sparse
 448
 449 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 450                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 451 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 452 NOSTDINC_FLAGS :=
 453 CFLAGS_MODULE   =
 454 AFLAGS_MODULE   =
 455 LDFLAGS_MODULE  =
 456 CFLAGS_KERNEL   =
 457 AFLAGS_KERNEL   =
 458 LDFLAGS_vmlinux =
 459
 460 # Prefer linux-backports-modules
 461 ifneq ($(KBUILD_SRC),)
 462 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 463 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 464 endif
 465 endif
 466
 467 # Use USERINCLUDE when you must reference the UAPI directories only.
 468 USERINCLUDE    := \
 469                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 470                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 471                 -I$(srctree)/include/uapi \
 472                 -I$(objtree)/include/generated/uapi \
 473                 -include $(srctree)/include/linux/kconfig.h
 474
 475 # Use LINUXINCLUDE when you must reference the include/ directory.
 476 # Needed to be compatible with the O= option
 477 LINUXINCLUDE    := \
 478                 $(UBUNTUINCLUDE) \
 479                 -I$(srctree)/arch/$(SRCARCH)/include \
 480                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 481                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 482                 -I$(objtree)/include \
 483                 $(USERINCLUDE)
 484
 485 # UBUNTU: Include our third party driver stuff too
 486 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 487
 488 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 489 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 490                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 491                    -Werror=implicit-function-declaration -Werror=implicit-int \
 492                    -Wno-format-security \
 493                    -std=gnu89
 494 KBUILD_CPPFLAGS := -D__KERNEL__
 495 KBUILD_AFLAGS_KERNEL :=
 496 KBUILD_CFLAGS_KERNEL :=
 497 KBUILD_AFLAGS_MODULE  := -DMODULE
 498 KBUILD_CFLAGS_MODULE  := -DMODULE
 499 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 500 KBUILD_LDFLAGS :=
 501 GCC_PLUGINS_CFLAGS :=
 502 CLANG_FLAGS :=
 503
 504 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 505 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 506 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 507 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 508
 509 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 510 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 511 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 512 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 513 export KBUILD_KMSG_CHECK KMSG_CHECK
 514 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 515 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 516 export KBUILD_ARFLAGS
 517
 518 # Files to ignore in find ... statements
 519
 520 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 521                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 522                           -prune -o
 523 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 524                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 525
 526 # ===========================================================================
 527 # Rules shared between *config targets and build targets
 528
 529 # Basic helpers built in scripts/basic/
 530 PHONY += scripts_basic
 531 scripts_basic:
 532         $(Q)$(MAKE) $(build)=scripts/basic
 533         $(Q)rm -f .tmp_quiet_recordmcount
 534
 535 PHONY += outputmakefile
 536 # outputmakefile generates a Makefile in the output directory, if using a
 537 # separate output directory. This allows convenient use of make in the
 538 # output directory.
 539 # At the same time when output Makefile generated, generate .gitignore to
 540 # ignore whole output directory
 541 outputmakefile:
 542 ifdef building_out_of_srctree
 543         $(Q)ln -fsn $(srctree) source
 544         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 545         $(Q)test -e .gitignore || \
 546         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 547 endif
 548
 549 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 550 ifneq ($(CROSS_COMPILE),)
 551 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 552 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 553 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 554 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 555 endif
 556 ifneq ($(GCC_TOOLCHAIN),)
 557 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 558 endif
 559 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 560 CLANG_FLAGS     += -no-integrated-as
 561 endif
 562 CLANG_FLAGS     += -Werror=unknown-warning-option
 563 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 564 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 565 export CLANG_FLAGS
 566 endif
 567
 568 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 569 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 570 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 571 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 572 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 573
 574 ifeq ($(config-targets),1)
 575 # ===========================================================================
 576 # *config targets only - make sure prerequisites are updated, and descend
 577 # in scripts/kconfig to make the *config target
 578
 579 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 580 # KBUILD_DEFCONFIG may point out an alternative default configuration
 581 # used for 'make defconfig'
 582 include arch/$(SRCARCH)/Makefile
 583 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 584
 585 config: scripts_basic outputmakefile FORCE
 586         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 587
 588 %config: scripts_basic outputmakefile FORCE
 589         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 590
 591 else
 592 # ===========================================================================
 593 # Build targets only - this includes vmlinux, arch specific targets, clean
 594 # targets and others. In general all targets except *config targets.
 595
 596 # If building an external module we do not care about the all: rule
 597 # but instead _all depend on modules
 598 PHONY += all
 599 ifeq ($(KBUILD_EXTMOD),)
 600 _all: all
 601 else
 602 _all: modules
 603 endif
 604
 605 # Decide whether to build built-in, modular, or both.
 606 # Normally, just do built-in.
 607
 608 KBUILD_MODULES :=
 609 KBUILD_BUILTIN := 1
 610
 611 # If we have only "make modules", don't compile built-in objects.
 612 # When we're building modules with modversions, we need to consider
 613 # the built-in objects during the descend as well, in order to
 614 # make sure the checksums are up to date before we record them.
 615
 616 ifeq ($(MAKECMDGOALS),modules)
 617   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 618 endif
 619
 620 # If we have "make <whatever> modules", compile modules
 621 # in addition to whatever we do anyway.
 622 # Just "make" or "make all" shall build modules as well
 623
 624 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 625   KBUILD_MODULES := 1
 626 endif
 627
 628 ifeq ($(MAKECMDGOALS),)
 629   KBUILD_MODULES := 1
 630 endif
 631
 632 export KBUILD_MODULES KBUILD_BUILTIN
 633
 634 ifeq ($(dot-config),1)
 635 include include/config/auto.conf
 636 endif
 637
 638 ifeq ($(KBUILD_EXTMOD),)
 639 # Objects we will link into vmlinux / subdirs we need to visit
 640 init-y          := init/
 641 drivers-y       := drivers/ sound/ ubuntu/
 642 drivers-$(CONFIG_SAMPLES) += samples/
 643 drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
 644 net-y           := net/
 645 libs-y          := lib/
 646 core-y          := usr/
 647 virt-y          := virt/
 648 endif # KBUILD_EXTMOD
 649
 650 # The all: target is the default when no target is given on the
 651 # command line.
 652 # This allow a user to issue only 'make' to build a kernel including modules
 653 # Defaults to vmlinux, but the arch makefile usually adds further targets
 654 all: vmlinux
 655
 656 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 657         $(call cc-option,-fno-tree-loop-im) \
 658         $(call cc-disable-warning,maybe-uninitialized,)
 659 export CFLAGS_GCOV
 660
 661 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 662 ifdef CONFIG_FUNCTION_TRACER
 663   CC_FLAGS_FTRACE := -pg
 664 endif
 665
 666 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 667 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 668 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 669 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 670 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 671 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 672 export RETPOLINE_CFLAGS
 673 export RETPOLINE_VDSO_CFLAGS
 674
 675 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 676 # values of the respective KBUILD_* variables
 677 ARCH_CPPFLAGS :=
 678 ARCH_AFLAGS :=
 679 ARCH_CFLAGS :=
 680 include arch/$(SRCARCH)/Makefile
 681
 682 ifeq ($(dot-config),1)
 683 ifeq ($(may-sync-config),1)
 684 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 685 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 686 # because some architectures define CROSS_COMPILE there.
 687 include include/config/auto.conf.cmd
 688
 689 $(KCONFIG_CONFIG):
 690         @echo >&2 '***'
 691         @echo >&2 '*** Configuration file "$@" not found!'
 692         @echo >&2 '***'
 693         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 694         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 695         @echo >&2 '***'
 696         @/bin/false
 697
 698 # The actual configuration files used during the build are stored in
 699 # include/generated/ and include/config/. Update them if .config is newer than
 700 # include/config/auto.conf (which mirrors .config).
 701 #
 702 # This exploits the 'multi-target pattern rule' trick.
 703 # The syncconfig should be executed only once to make all the targets.
 704 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 705         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 706 else
 707 # External modules and some install targets need include/generated/autoconf.h
 708 # and include/config/auto.conf but do not care if they are up-to-date.
 709 # Use auto.conf to trigger the test
 710 PHONY += include/config/auto.conf
 711
 712 include/config/auto.conf:
 713         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 714         echo >&2;                                                       \
 715         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 716         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 717         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 718         echo >&2 ;                                                      \
 719         /bin/false)
 720
 721 endif # may-sync-config
 722 endif # $(dot-config)
 723
 724 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 725 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 726 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 727 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 728 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 729
 730 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 731 KBUILD_CFLAGS   += -Os
 732 else
 733 KBUILD_CFLAGS   += -O2
 734 endif
 735
 736 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 737 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 738 endif
 739
 740 # Tell gcc to never replace conditional load with a non-conditional one
 741 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 742
 743 include scripts/Makefile.kcov
 744 include scripts/Makefile.gcc-plugins
 745
 746 ifdef CONFIG_READABLE_ASM
 747 # Disable optimizations that make assembler listings hard to read.
 748 # reorder blocks reorders the control in the function
 749 # ipa clone creates specialized cloned functions
 750 # partial inlining inlines only parts of functions
 751 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 752                  $(call cc-option,-fno-ipa-cp-clone,) \
 753                  $(call cc-option,-fno-partial-inlining)
 754 endif
 755
 756 ifneq ($(CONFIG_FRAME_WARN),0)
 757 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 758 endif
 759
 760 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 761 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 762 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 763
 764 KBUILD_CFLAGS += $(stackp-flags-y)
 765
 766 ifdef CONFIG_CC_IS_CLANG
 767 KBUILD_CPPFLAGS += -Qunused-arguments
 768 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 769 KBUILD_CFLAGS += -Wno-gnu
 770 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 771 KBUILD_CFLAGS += -Wno-tautological-compare
 772 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 773 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 774 # See modpost pattern 2
 775 KBUILD_CFLAGS += -mno-global-merge
 776 else
 777
 778 # These warnings generated too much noise in a regular build.
 779 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 780 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 781
 782 # Warn about unmarked fall-throughs in switch statement.
 783 # Disabled for clang while comment to attribute conversion happens and
 784 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 785 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 786 endif
 787
 788 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 789 ifdef CONFIG_FRAME_POINTER
 790 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 791 else
 792 # Some targets (ARM with Thumb2, for example), can't be built with frame
 793 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 794 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 795 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 796 # -fomit-frame-pointer with FUNCTION_TRACER.
 797 ifndef CONFIG_FUNCTION_TRACER
 798 KBUILD_CFLAGS   += -fomit-frame-pointer
 799 endif
 800 endif
 801
 802 # Initialize all stack variables with a pattern, if desired.
 803 ifdef CONFIG_INIT_STACK_ALL
 804 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 805 endif
 806
 807 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 808
 809 ifdef CONFIG_DEBUG_INFO
 810 ifdef CONFIG_DEBUG_INFO_SPLIT
 811 DEBUG_CFLAGS    += -gsplit-dwarf
 812 else
 813 DEBUG_CFLAGS    += -g
 814 endif
 815 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 816 endif
 817 ifdef CONFIG_DEBUG_INFO_DWARF4
 818 DEBUG_CFLAGS    += -gdwarf-4
 819 endif
 820
 821 ifdef CONFIG_DEBUG_INFO_REDUCED
 822 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 823                    $(call cc-option,-fno-var-tracking)
 824 endif
 825
 826 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 827 export DEBUG_CFLAGS
 828
 829 ifdef CONFIG_FUNCTION_TRACER
 830 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 831   # gcc 5 supports generating the mcount tables directly
 832   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 833     CC_FLAGS_FTRACE     += -mrecord-mcount
 834     export CC_USING_RECORD_MCOUNT := 1
 835   endif
 836   ifdef CONFIG_HAVE_NOP_MCOUNT
 837     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 838       CC_FLAGS_FTRACE   += -mnop-mcount
 839       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 840     endif
 841   endif
 842 endif
 843 ifdef CONFIG_HAVE_FENTRY
 844   ifeq ($(call cc-option-yn, -mfentry),y)
 845     CC_FLAGS_FTRACE     += -mfentry
 846     CC_FLAGS_USING      += -DCC_USING_FENTRY
 847   endif
 848 endif
 849 export CC_FLAGS_FTRACE
 850 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 851 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 852 ifdef CONFIG_DYNAMIC_FTRACE
 853         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 854                 BUILD_C_RECORDMCOUNT := y
 855                 export BUILD_C_RECORDMCOUNT
 856         endif
 857 endif
 858 endif
 859
 860 # We trigger additional mismatches with less inlining
 861 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 862 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 863 endif
 864
 865 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 866 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 867 LDFLAGS_vmlinux += --gc-sections
 868 endif
 869
 870 ifdef CONFIG_LIVEPATCH
 871 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 872 endif
 873
 874 # arch Makefile may override CC so keep this after arch Makefile is included
 875 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 876
 877 # warn about C99 declaration after statement
 878 KBUILD_CFLAGS += -Wdeclaration-after-statement
 879
 880 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 881 KBUILD_CFLAGS += -Wvla
 882
 883 # disable pointer signed / unsigned warnings in gcc 4.0
 884 KBUILD_CFLAGS += -Wno-pointer-sign
 885
 886 # disable stringop warnings in gcc 8+
 887 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 888
 889 # disable invalid "can't wrap" optimizations for signed / pointers
 890 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 891
 892 # clang sets -fmerge-all-constants by default as optimization, but this
 893 # is non-conforming behavior for C and in fact breaks the kernel, so we
 894 # need to disable it here generally.
 895 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 896
 897 # for gcc -fno-merge-all-constants disables everything, but it is fine
 898 # to have actual conforming behavior enabled.
 899 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 900
 901 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 902 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 903
 904 # conserve stack if available
 905 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 906
 907 # Prohibit date/time macros, which would make the build non-deterministic
 908 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 909
 910 # enforce correct pointer usage
 911 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 912
 913 # Require designated initializers for all marked structures
 914 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 915
 916 # change __FILE__ to the relative path from the srctree
 917 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 918
 919 # ensure -fcf-protection is disabled when using retpoline as it is
 920 # incompatible with -mindirect-branch=thunk-extern
 921 ifdef CONFIG_RETPOLINE
 922 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 923 endif
 924
 925 # use the deterministic mode of AR if available
 926 KBUILD_ARFLAGS := $(call ar-option,D)
 927
 928 include scripts/Makefile.kasan
 929 include scripts/Makefile.extrawarn
 930 include scripts/Makefile.ubsan
 931
 932 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 933 # last assignments
 934 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 935 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 936 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 937
 938 KBUILD_LDFLAGS_MODULE += --build-id
 939 LDFLAGS_vmlinux += --build-id
 940
 941 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 942 LDFLAGS_vmlinux += $(call ld-option, -X,)
 943 endif
 944
 945 # insure the checker run with the right endianness
 946 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 947
 948 # the checker needs the correct machine size
 949 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 950
 951 # Default kernel image to build when no specific target is given.
 952 # KBUILD_IMAGE may be overruled on the command line or
 953 # set in the environment
 954 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 955 # this default value
 956 export KBUILD_IMAGE ?= vmlinux
 957
 958 #
 959 # INSTALL_PATH specifies where to place the updated kernel and system map
 960 # images. Default is /boot, but you can set it to other values
 961 export  INSTALL_PATH ?= /boot
 962
 963 #
 964 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 965 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 966 # an argument if needed. Otherwise it defaults to the kernel install path
 967 #
 968 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 969
 970 #
 971 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 972 # relocations required by build roots.  This is not defined in the
 973 # makefile but the argument can be passed to make if needed.
 974 #
 975
 976 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 977 export MODLIB
 978
 979 #
 980 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 981 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 982 # the default option --strip-debug will be used.  Otherwise,
 983 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 984
 985 ifdef INSTALL_MOD_STRIP
 986 ifeq ($(INSTALL_MOD_STRIP),1)
 987 mod_strip_cmd = $(STRIP) --strip-debug
 988 else
 989 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 990 endif # INSTALL_MOD_STRIP=1
 991 else
 992 mod_strip_cmd = true
 993 endif # INSTALL_MOD_STRIP
 994 export mod_strip_cmd
 995
 996 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 997 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 998 # or CONFIG_MODULE_COMPRESS_XZ.
 999
1000 mod_compress_cmd = true
1001 ifdef CONFIG_MODULE_COMPRESS
1002   ifdef CONFIG_MODULE_COMPRESS_GZIP
1003     mod_compress_cmd = gzip -n -f
1004   endif # CONFIG_MODULE_COMPRESS_GZIP
1005   ifdef CONFIG_MODULE_COMPRESS_XZ
1006     mod_compress_cmd = xz -f
1007   endif # CONFIG_MODULE_COMPRESS_XZ
1008 endif # CONFIG_MODULE_COMPRESS
1009 export mod_compress_cmd
1010
1011 ifdef CONFIG_MODULE_SIG_ALL
1012 $(eval $(call config_filename,MODULE_SIG_KEY))
1013
1014 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1015 else
1016 mod_sign_cmd = true
1017 endif
1018 export mod_sign_cmd
1019
1020 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1021
1022 ifdef CONFIG_STACK_VALIDATION
1023   has_libelf := $(call try-run,\
1024                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1025   ifeq ($(has_libelf),1)
1026     objtool_target := tools/objtool FORCE
1027   else
1028     SKIP_STACK_VALIDATION := 1
1029     export SKIP_STACK_VALIDATION
1030   endif
1031 endif
1032
1033 PHONY += prepare0
1034
1035 export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
1036
1037 ifeq ($(KBUILD_EXTMOD),)
1038 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1039
1040 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1041                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1042                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1043
1044 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1045                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1046                         $(drivers-) $(net-) $(libs-) $(virt-))))
1047
1048 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1049 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1050 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1051 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1052 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1053 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1054 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1055
1056 # Externally visible symbols (used by link-vmlinux.sh)
1057 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1058                               $(drivers-y) $(net-y) $(virt-y)
1059 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1060 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1061 export LDFLAGS_vmlinux
1062 # used by scripts/package/Makefile
1063 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1064
1065 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1066
1067 # Recurse until adjust_autoksyms.sh is satisfied
1068 PHONY += autoksyms_recursive
1069 ifdef CONFIG_TRIM_UNUSED_KSYMS
1070 autoksyms_recursive: $(vmlinux-deps) modules.order
1071         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1072           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1073 endif
1074
1075 # For the kernel to actually contain only the needed exported symbols,
1076 # we have to build modules as well to determine what those symbols are.
1077 # (this can be evaluated only once include/config/auto.conf has been included)
1078 ifdef CONFIG_TRIM_UNUSED_KSYMS
1079   KBUILD_MODULES := 1
1080 endif
1081
1082 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1083
1084 $(autoksyms_h):
1085         $(Q)mkdir -p $(dir $@)
1086         $(Q)touch $@
1087
1088 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1089
1090 # Final link of vmlinux with optional arch pass after final link
1091 cmd_link-vmlinux =                                                 \
1092         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1093         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1094
1095 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1096         +$(call if_changed,link-vmlinux)
1097
1098 targets := vmlinux
1099
1100 # The actual objects are generated when descending,
1101 # make sure no implicit rule kicks in
1102 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1103
1104 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1105 # Preset locale variables to speed up the build process. Limit locale
1106 # tweaks to this spot to avoid wrong language settings when running
1107 # make menuconfig etc.
1108 # Error messages still appears in the original language
1109
1110 PHONY += $(vmlinux-dirs)
1111 $(vmlinux-dirs): prepare
1112         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
1113
1114 filechk_kernel.release = \
1115         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1116
1117 # Store (new) KERNELRELEASE string in include/config/kernel.release
1118 include/config/kernel.release: FORCE
1119         $(call filechk,kernel.release)
1120
1121 # Additional helpers built in scripts/
1122 # Carefully list dependencies so we do not try to build scripts twice
1123 # in parallel
1124 PHONY += scripts
1125 scripts: scripts_basic scripts_dtc
1126         $(Q)$(MAKE) $(build)=$(@)
1127
1128 # Things we need to do before we recursively start building the kernel
1129 # or the modules are listed in "prepare".
1130 # A multi level approach is used. prepareN is processed before prepareN-1.
1131 # archprepare is used in arch Makefiles and when processed asm symlink,
1132 # version.h and scripts_basic is processed / created.
1133
1134 PHONY += prepare archprepare prepare3
1135
1136 # prepare3 is used to check if we are building in a separate output directory,
1137 # and if so do:
1138 # 1) Check that make has not been executed in the kernel src $(srctree)
1139 prepare3: include/config/kernel.release
1140 ifdef building_out_of_srctree
1141         @$(kecho) '  Using $(srctree) as source for kernel'
1142         $(Q)if [ -f $(srctree)/.config -o \
1143                  -d $(srctree)/include/config -o \
1144                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1145                 echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
1146                 echo >&2 "  in the '$(srctree)' directory.";\
1147                 /bin/false; \
1148         fi;
1149 endif
1150
1151 archprepare: archheaders archscripts scripts prepare3 outputmakefile \
1152         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1153
1154 prepare0: archprepare
1155         $(Q)$(MAKE) $(build)=scripts/mod
1156         $(Q)$(MAKE) $(build)=.
1157
1158 # All the preparing..
1159 prepare: prepare0 prepare-objtool
1160
1161 # Support for using generic headers in asm-generic
1162 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1163
1164 PHONY += asm-generic uapi-asm-generic
1165 asm-generic: uapi-asm-generic
1166         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1167         generic=include/asm-generic
1168 uapi-asm-generic:
1169         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1170         generic=include/uapi/asm-generic
1171
1172 PHONY += prepare-objtool
1173 prepare-objtool: $(objtool_target)
1174 ifeq ($(SKIP_STACK_VALIDATION),1)
1175 ifdef CONFIG_UNWINDER_ORC
1176         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1177         @false
1178 else
1179         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1180 endif
1181 endif
1182
1183 # Generate some files
1184 # ---------------------------------------------------------------------------
1185
1186 # KERNELRELEASE can change from a few different places, meaning version.h
1187 # needs to be updated, so this check is forced on all builds
1188
1189 uts_len := 64
1190 define filechk_utsrelease.h
1191         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1192           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1193           exit 1;                                                         \
1194         fi;                                                               \
1195         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1196 endef
1197
1198 define filechk_version.h
1199         echo \#define LINUX_VERSION_CODE $(shell                         \
1200         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1201         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1202 endef
1203
1204 $(version_h): FORCE
1205         $(call filechk,version.h)
1206         $(Q)rm -f $(old_version_h)
1207
1208 include/generated/utsrelease.h: include/config/kernel.release FORCE
1209         $(call filechk,utsrelease.h)
1210
1211 PHONY += headerdep
1212 headerdep:
1213         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1214         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1215
1216 # ---------------------------------------------------------------------------
1217 # Kernel headers
1218
1219 #Default location for installed headers
1220 export INSTALL_HDR_PATH = $(objtree)/usr
1221
1222 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1223       cmd_headers_install = \
1224         mkdir -p $(INSTALL_HDR_PATH); \
1225         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1226         usr/include $(INSTALL_HDR_PATH)
1227
1228 PHONY += headers_install
1229 headers_install: headers
1230         $(call cmd,headers_install)
1231
1232 PHONY += archheaders archscripts
1233
1234 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1235
1236 PHONY += headers
1237 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1238         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1239           $(error Headers not exportable for the $(SRCARCH) architecture))
1240         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1241         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1242         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1243
1244 PHONY += headers_check
1245 headers_check: headers
1246         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1247         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1248         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1249
1250 ifdef CONFIG_HEADERS_INSTALL
1251 prepare: headers
1252 endif
1253
1254 ifdef CONFIG_HEADERS_CHECK
1255 all: headers_check
1256 endif
1257
1258 PHONY += scripts_unifdef
1259 scripts_unifdef: scripts_basic
1260         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1261
1262 # ---------------------------------------------------------------------------
1263 # Kernel selftest
1264
1265 PHONY += kselftest
1266 kselftest:
1267         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1268
1269 PHONY += kselftest-clean
1270 kselftest-clean:
1271         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1272
1273 PHONY += kselftest-merge
1274 kselftest-merge:
1275         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1276         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1277                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1278         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1279
1280 # ---------------------------------------------------------------------------
1281 # Devicetree files
1282
1283 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1284 dtstree := arch/$(SRCARCH)/boot/dts
1285 endif
1286
1287 ifneq ($(dtstree),)
1288
1289 %.dtb: prepare3 scripts_dtc
1290         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1291
1292 PHONY += dtbs dtbs_install dt_binding_check
1293 dtbs dtbs_check: prepare3 scripts_dtc
1294         $(Q)$(MAKE) $(build)=$(dtstree)
1295
1296 dtbs_check: export CHECK_DTBS=1
1297 dtbs_check: dt_binding_check
1298
1299 dtbs_install:
1300         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1301
1302 ifdef CONFIG_OF_EARLY_FLATTREE
1303 all: dtbs
1304 endif
1305
1306 endif
1307
1308 PHONY += scripts_dtc
1309 scripts_dtc: scripts_basic
1310         $(Q)$(MAKE) $(build)=scripts/dtc
1311
1312 dt_binding_check: scripts_dtc
1313         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1314
1315 # ---------------------------------------------------------------------------
1316 # Modules
1317
1318 ifdef CONFIG_MODULES
1319
1320 # By default, build modules as well
1321
1322 all: modules
1323
1324 # Build modules
1325 #
1326 # A module can be listed more than once in obj-m resulting in
1327 # duplicate lines in modules.order files.  Those are removed
1328 # using awk while concatenating to the final file.
1329
1330 PHONY += modules
1331 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1332         @$(kecho) '  Building modules, stage 2.';
1333         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1334         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1335
1336 modules.order: $(vmlinux-dirs)
1337         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1338
1339 modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1340
1341 modules.builtin: $(modbuiltin-dirs)
1342         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1343
1344 PHONY += $(modbuiltin-dirs)
1345 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1346 # here to make it self-healing in case somebody accidentally removes it.
1347 $(modbuiltin-dirs): include/config/tristate.conf
1348         $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1349
1350 # Target to prepare building external modules
1351 PHONY += modules_prepare
1352 modules_prepare: prepare
1353
1354 # Target to install modules
1355 PHONY += modules_install
1356 modules_install: _modinst_ _modinst_post
1357
1358 PHONY += _modinst_
1359 _modinst_:
1360         @rm -rf $(MODLIB)/kernel
1361         @rm -f $(MODLIB)/source
1362         @mkdir -p $(MODLIB)/kernel
1363         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1364         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1365                 rm -f $(MODLIB)/build ; \
1366                 ln -s $(CURDIR) $(MODLIB)/build ; \
1367         fi
1368         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1369         @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1370         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1371         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1372
1373 # This depmod is only for convenience to give the initial
1374 # boot a modules.dep even before / is mounted read-write.  However the
1375 # boot script depmod is the master version.
1376 PHONY += _modinst_post
1377 _modinst_post: _modinst_
1378         $(call cmd,depmod)
1379
1380 ifeq ($(CONFIG_MODULE_SIG), y)
1381 PHONY += modules_sign
1382 modules_sign:
1383         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1384 endif
1385
1386 else # CONFIG_MODULES
1387
1388 # Modules not configured
1389 # ---------------------------------------------------------------------------
1390
1391 PHONY += modules modules_install
1392 modules modules_install:
1393         @echo >&2
1394         @echo >&2 "The present kernel configuration has modules disabled."
1395         @echo >&2 "Type 'make config' and enable loadable module support."
1396         @echo >&2 "Then build a kernel with module support enabled."
1397         @echo >&2
1398         @exit 1
1399
1400 endif # CONFIG_MODULES
1401
1402 ###
1403 # Cleaning is done on three levels.
1404 # make clean     Delete most generated files
1405 #                Leave enough to build external modules
1406 # make mrproper  Delete the current configuration, and all generated files
1407 # make distclean Remove editor backup files, patch leftover files and the like
1408
1409 # Directories & files removed with 'make clean'
1410 CLEAN_DIRS  += include/ksym
1411 CLEAN_FILES += modules.builtin.modinfo
1412
1413 # Directories & files removed with 'make mrproper'
1414 MRPROPER_DIRS  += include/config include/generated          \
1415                   arch/$(SRCARCH)/include/generated .tmp_objdiff
1416 MRPROPER_FILES += .config .config.old .version \
1417                   Module.symvers \
1418                   signing_key.pem signing_key.priv signing_key.x509     \
1419                   x509.genkey extra_certificates signing_key.x509.keyid \
1420                   signing_key.x509.signer vmlinux-gdb.py
1421
1422 # Directories & files removed with 'make distclean'
1423 DISTCLEAN_DIRS  +=
1424 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1425
1426 # clean - Delete most, but leave enough to build external modules
1427 #
1428 clean: rm-dirs  := $(CLEAN_DIRS)
1429 clean: rm-files := $(CLEAN_FILES)
1430 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
1431
1432 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1433 $(clean-dirs):
1434         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1435
1436 vmlinuxclean:
1437         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1438         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1439
1440 clean: archclean vmlinuxclean
1441
1442 # mrproper - Delete all generated files, including .config
1443 #
1444 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1445 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1446 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1447
1448 PHONY += $(mrproper-dirs) mrproper
1449 $(mrproper-dirs):
1450         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1451
1452 mrproper: clean $(mrproper-dirs)
1453         $(call cmd,rmdirs)
1454         $(call cmd,rmfiles)
1455
1456 # distclean
1457 #
1458 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1459 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1460
1461 PHONY += distclean
1462
1463 distclean: mrproper
1464         $(call cmd,rmdirs)
1465         $(call cmd,rmfiles)
1466         @find $(srctree) $(RCS_FIND_IGNORE) \
1467                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1468                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1469                 -o -name 'core' \) \
1470                 -type f -print | xargs rm -f
1471
1472
1473 # Packaging of the kernel to various formats
1474 # ---------------------------------------------------------------------------
1475 package-dir     := scripts/package
1476
1477 %src-pkg: FORCE
1478         $(Q)$(MAKE) $(build)=$(package-dir) $@
1479 %pkg: include/config/kernel.release FORCE
1480         $(Q)$(MAKE) $(build)=$(package-dir) $@
1481
1482
1483 # Brief documentation of the typical targets used
1484 # ---------------------------------------------------------------------------
1485
1486 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1487 boards := $(sort $(notdir $(boards)))
1488 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1489 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1490
1491 PHONY += help
1492 help:
1493         @echo  'Cleaning targets:'
1494         @echo  '  clean           - Remove most generated files but keep the config and'
1495         @echo  '                    enough build support to build external modules'
1496         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1497         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1498         @echo  ''
1499         @echo  'Configuration targets:'
1500         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1501         @echo  ''
1502         @echo  'Other generic targets:'
1503         @echo  '  all             - Build all targets marked with [*]'
1504         @echo  '* vmlinux         - Build the bare kernel'
1505         @echo  '* modules         - Build all modules'
1506         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1507         @echo  '  dir/            - Build all files in dir and below'
1508         @echo  '  dir/file.[ois]  - Build specified target only'
1509         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1510         @echo  '                    (requires compiler support for LLVM assembly generation)'
1511         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1512         @echo  '                    (requires a recent binutils and recent build (System.map))'
1513         @echo  '  dir/file.ko     - Build module including final link'
1514         @echo  '  modules_prepare - Set up for building external modules'
1515         @echo  '  tags/TAGS       - Generate tags file for editors'
1516         @echo  '  cscope          - Generate cscope index'
1517         @echo  '  gtags           - Generate GNU GLOBAL index'
1518         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1519         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1520         @echo  '  image_name      - Output the image name (use with make -s)'
1521         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1522          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1523          echo  ''
1524         @echo  'Static analysers:'
1525         @echo  '  checkstack      - Generate a list of stack hogs'
1526         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1527         @echo  '  versioncheck    - Sanity check on version.h usage'
1528         @echo  '  includecheck    - Check for duplicate included header files'
1529         @echo  '  export_report   - List the usages of all exported symbols'
1530         @echo  '  headers_check   - Sanity check on exported headers'
1531         @echo  '  headerdep       - Detect inclusion cycles in headers'
1532         @echo  '  coccicheck      - Check with Coccinelle'
1533         @echo  ''
1534         @echo  'Kernel selftest:'
1535         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1536         @echo  '                    Build, install, and boot kernel before'
1537         @echo  '                    running kselftest on it'
1538         @echo  '  kselftest-clean - Remove all generated kselftest files'
1539         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1540         @echo  '                    .config.'
1541         @echo  ''
1542         @$(if $(dtstree), \
1543                 echo 'Devicetree:'; \
1544                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1545                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1546                 echo '')
1547
1548         @echo 'Userspace tools targets:'
1549         @echo '  use "make tools/help"'
1550         @echo '  or  "cd tools; make help"'
1551         @echo  ''
1552         @echo  'Kernel packaging:'
1553         @$(MAKE) $(build)=$(package-dir) help
1554         @echo  ''
1555         @echo  'Documentation targets:'
1556         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1557         @echo  ''
1558         @echo  'Architecture specific targets ($(SRCARCH)):'
1559         @$(if $(archhelp),$(archhelp),\
1560                 echo '  No architecture specific help defined for $(SRCARCH)')
1561         @echo  ''
1562         @$(if $(boards), \
1563                 $(foreach b, $(boards), \
1564                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1565                 echo '')
1566         @$(if $(board-dirs), \
1567                 $(foreach b, $(board-dirs), \
1568                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1569                 printf "  %-16s - Show all of the above\\n" help-boards; \
1570                 echo '')
1571
1572         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1573         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1574         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1575         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1576         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1577         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1578         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1579         @echo  '                1: warnings which may be relevant and do not occur too often'
1580         @echo  '                2: warnings which occur quite often but may still be relevant'
1581         @echo  '                3: more obscure warnings, can most likely be ignored'
1582         @echo  '                Multiple levels can be combined with W=12 or W=123'
1583         @echo  ''
1584         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1585         @echo  'For further info see the ./README file'
1586
1587
1588 help-board-dirs := $(addprefix help-,$(board-dirs))
1589
1590 help-boards: $(help-board-dirs)
1591
1592 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1593
1594 $(help-board-dirs): help-%:
1595         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1596         @$(if $(boards-per-dir), \
1597                 $(foreach b, $(boards-per-dir), \
1598                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1599                 echo '')
1600
1601
1602 # Documentation targets
1603 # ---------------------------------------------------------------------------
1604 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1605                linkcheckdocs dochelp refcheckdocs
1606 PHONY += $(DOC_TARGETS)
1607 $(DOC_TARGETS): scripts_basic FORCE
1608         $(Q)$(MAKE) $(build)=Documentation $@
1609
1610 # Misc
1611 # ---------------------------------------------------------------------------
1612
1613 PHONY += scripts_gdb
1614 scripts_gdb: prepare0
1615         $(Q)$(MAKE) $(build)=scripts/gdb
1616         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1617
1618 ifdef CONFIG_GDB_SCRIPTS
1619 all: scripts_gdb
1620 endif
1621
1622 else # KBUILD_EXTMOD
1623
1624 ###
1625 # External module support.
1626 # When building external modules the kernel used as basis is considered
1627 # read-only, and no consistency checks are made and the make
1628 # system is not used on the basis kernel. If updates are required
1629 # in the basis kernel ordinary make commands (without M=...) must
1630 # be used.
1631 #
1632 # The following are the only valid targets when building external
1633 # modules.
1634 # make M=dir clean     Delete all automatically generated files
1635 # make M=dir modules   Make all modules in specified dir
1636 # make M=dir           Same as 'make M=dir modules'
1637 # make M=dir modules_install
1638 #                      Install the modules built in the module directory
1639 #                      Assumes install directory is already created
1640
1641 # We are always building modules
1642 KBUILD_MODULES := 1
1643
1644 PHONY += $(objtree)/Module.symvers
1645 $(objtree)/Module.symvers:
1646         @test -e $(objtree)/Module.symvers || ( \
1647         echo; \
1648         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1649         echo "           is missing; modules will have no dependencies and modversions."; \
1650         echo )
1651
1652 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1653 PHONY += $(module-dirs) modules
1654 $(module-dirs): prepare $(objtree)/Module.symvers
1655         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
1656
1657 modules: $(module-dirs)
1658         @$(kecho) '  Building modules, stage 2.';
1659         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1660
1661 PHONY += modules_install
1662 modules_install: _emodinst_ _emodinst_post
1663
1664 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1665 PHONY += _emodinst_
1666 _emodinst_:
1667         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1668         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1669
1670 PHONY += _emodinst_post
1671 _emodinst_post: _emodinst_
1672         $(call cmd,depmod)
1673
1674 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1675
1676 PHONY += $(clean-dirs) clean
1677 $(clean-dirs):
1678         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1679
1680 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1681
1682 PHONY += help
1683 help:
1684         @echo  '  Building external modules.'
1685         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1686         @echo  ''
1687         @echo  '  modules         - default target, build the module(s)'
1688         @echo  '  modules_install - install the module'
1689         @echo  '  clean           - remove generated files in module directory only'
1690         @echo  ''
1691
1692 PHONY += prepare
1693 endif # KBUILD_EXTMOD
1694
1695 clean: $(clean-dirs)
1696         $(call cmd,rmdirs)
1697         $(call cmd,rmfiles)
1698         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1699                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1700                 -o -name '*.ko.*' \
1701                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1702                 -o -name '*.dwo' -o -name '*.lst' \
1703                 -o -name '*.su' -o -name '*.mod' \
1704                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1705                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1706                 -o -name '*.asn1.[ch]' \
1707                 -o -name '*.symtypes' -o -name 'modules.order' \
1708                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1709                 -o -name '*.c.[012]*.*' \
1710                 -o -name '*.ll' \
1711                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1712
1713 # Generate tags for editors
1714 # ---------------------------------------------------------------------------
1715 quiet_cmd_tags = GEN     $@
1716       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1717
1718 tags TAGS cscope gtags: FORCE
1719         $(call cmd,tags)
1720
1721 # Scripts to check various things for consistency
1722 # ---------------------------------------------------------------------------
1723
1724 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1725
1726 includecheck:
1727         find $(srctree)/* $(RCS_FIND_IGNORE) \
1728                 -name '*.[hcS]' -type f -print | sort \
1729                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1730
1731 versioncheck:
1732         find $(srctree)/* $(RCS_FIND_IGNORE) \
1733                 -name '*.[hcS]' -type f -print | sort \
1734                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1735
1736 coccicheck:
1737         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1738
1739 namespacecheck:
1740         $(PERL) $(srctree)/scripts/namespace.pl
1741
1742 export_report:
1743         $(PERL) $(srctree)/scripts/export_report.pl
1744
1745 PHONY += checkstack kernelrelease kernelversion image_name
1746
1747 # UML needs a little special treatment here.  It wants to use the host
1748 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1749 # else wants $(ARCH), including people doing cross-builds, which means
1750 # that $(SUBARCH) doesn't work here.
1751 ifeq ($(ARCH), um)
1752 CHECKSTACK_ARCH := $(SUBARCH)
1753 else
1754 CHECKSTACK_ARCH := $(ARCH)
1755 endif
1756 checkstack:
1757         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1758         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1759
1760 kernelrelease:
1761         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1762
1763 kernelversion:
1764         @echo $(KERNELVERSION)
1765
1766 image_name:
1767         @echo $(KBUILD_IMAGE)
1768
1769 # Clear a bunch of variables before executing the submake
1770
1771 ifeq ($(quiet),silent_)
1772 tools_silent=s
1773 endif
1774
1775 tools/: FORCE
1776         $(Q)mkdir -p $(objtree)/tools
1777         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1778
1779 tools/%: FORCE
1780         $(Q)mkdir -p $(objtree)/tools
1781         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1782
1783 # Single targets
1784 # ---------------------------------------------------------------------------
1785 # Single targets are compatible with:
1786 # - build with mixed source and output
1787 # - build with separate output dir 'make O=...'
1788 # - external modules
1789 #
1790 #  target-dir => where to store outputfile
1791 #  build-dir  => directory in kernel source tree to use
1792
1793 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1794 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1795
1796 %.i: prepare FORCE
1797         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1798 %.ll: prepare FORCE
1799         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1800 %.lst: prepare FORCE
1801         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1802 %.o: prepare FORCE
1803         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1804 %.s: prepare FORCE
1805         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1806 %.symtypes: prepare FORCE
1807         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1808 ifeq ($(KBUILD_EXTMOD),)
1809 # For the single build of an in-tree module, use a temporary file to avoid
1810 # the situation of modules_install installing an invalid modules.order.
1811 %.ko: MODORDER := .modules.tmp
1812 endif
1813 %.ko: prepare FORCE
1814         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
1815         $(Q)echo $(build-target) > $(MODORDER)
1816         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1817
1818 # Modules
1819 PHONY += /
1820 /: ./
1821
1822 %/: prepare FORCE
1823         $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
1824
1825 # FIXME Should go into a make.lib or something
1826 # ===========================================================================
1827
1828 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1829       cmd_rmdirs = rm -rf $(rm-dirs)
1830
1831 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1832       cmd_rmfiles = rm -f $(rm-files)
1833
1834 # Run depmod only if we have System.map and depmod is executable
1835 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1836       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1837                    $(KERNELRELEASE)
1838
1839 # read saved command lines for existing targets
1840 existing-targets := $(wildcard $(sort $(targets)))
1841
1842 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1843
1844 endif   # ifeq ($(config-targets),1)
1845 endif   # ifeq ($(mixed-targets),1)
1846 endif   # need-sub-make
1847
1848 PHONY += FORCE
1849 FORCE:
1850
1851 # Declare the contents of the PHONY variable as phony.  We keep that
1852 # information in a variable so we can use it in if_changed and friends.
1853 .PHONY: $(PHONY)